Testing pH. Universal indicator (left) being used to test the pH of a solution (centre) of sodium hydroxide as hydrochloric acid is added. As the acid

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Testing pH. Universal indicator (left) being used to test the pH of a solution (centre) of sodium hydroxide as hydrochloric acid is added. As the acid is added the indicator in the solution turns green when a neutral pH (pH 7) is reached.

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Photo credit: © TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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